Thanks for the feedback. Yeah, it crossed our mind that some people familiar with 3D graphics term might get confused. I really hope that there are not too many people in our target audience familiar with it, though I might be wrong :)
As to why exactly we picked it: as ray casting is a way to instantly query information about closest objects, we thought it would be a good metaphor for instantly querying and accessing different third party services. Rays represent speed and focus.